Frequent cloud storage authentication errors with Subsurface 4.5.6 (desktop)

[Adric Norris]

Is anyone else frequently seeing the following error when saving changes?

Authentication to cloud storage failed.
Cannot sync with cloud server, working with offline copy.


While this sometimes seems to be legitimate, often the error is displayed
even though the changes appear to have been saved successfully. For example
I'll change the Notes text for a recent dive and save (File -> Save), which
triggers the error. I then look it up my dives on
https://cloud.subsurface-divelog.org, and (frequently, but not always) find
that the changed text is indeed present. Attempting to save multiple times
in a row or choosing "Save to cloud storage" will sometimes complete
without error, but it's very inconsistent.

This has been going on for awhile but I'd been assuming it was an issue
with my home network, or notebook installation... I'm running Ubuntu 16.04
(Xenial), with Subsurface installed from the PPA. However I recently
upgraded Subsurface (from either 4.5.2 or 4.5.3, IIRC) on my sister's
macbook while we were visiting family, and she encountered the same stream
of errors when saving her first new dive... we ended up trying to save
about 4 times, before being confident all was well. Since the notebook, OS,
and network were all different, I now believe this to be a more general
issue.

Any idea how I can help to troubleshooting the issue? I'm happy to do
whatever I can, but am not really sure where to begin.

Thanx!

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